Fix transport serialization of EnrichStatsAction.Request
          #121735
        
          
      
                
     Merged
            
            
          
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In #121256, we changed the superclass of the request to
LocalClusterStateRequestto make the action run on the local node instead of the master node. Most of the actions that have been updated thusfar to run on the local node used to extendMasterNodeReadRequestand thus serialized alocalfield. This request class, however, extendedMasterNodeRequest, meaning that it didn't serialize that field.Fixes #121642